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Wiktionary
herkie

n. (context cheerleading English) A jump with one leg straight out to the side and the other bent flat beneath the body.

Wikipedia
Herkie

The Herkie (aka Hurkie) is a cheerleading jump named after Lawrence Herkimer, the founder of the National Cheerleaders Association and former cheerleader at Southern Methodist University. This jump is similar to a side-hurdler and to the abstract (double hook), except instead of the bent leg's knee being pointed downward, it should be flat while the other leg is straight in a straddle jump (toetouch) position.

The jump was invented accidentally, because Herkimer was not able to do an actual side-hurdler. Common misspellings include: Hurky, Herky.